Insensitivity of a turbulent laser-plasma dynamo to initial conditions
Abstract
It has recently been demonstrated experimentally that a turbulent plasma created by the collision of two inhomogeneous, asymmetric, weakly magnetized, laser-produced plasma jets can generate strong stochastic magnetic fields via the small-scale turbulent dynamo mechanism, provided the magnetic Reynolds number of the plasma is sufficiently large. In this paper, we compare such a plasma with one arising from two pre-magnetized plasma jets whose creation is identical save for the addition of a strong external magnetic field imposed by a pulsed magnetic field generator. We investigate the differences between the two turbulent systems using a Thomson-scattering diagnostic, x-ray self-emission imaging, and proton radiography. The Thomson-scattering spectra and x-ray images suggest that the external magnetic field has a limited effect on the plasma dynamics in the experiment. Although the external magnetic field induces collimation of the flows in the colliding plasma jets and although the initial strengths of the magnetic fields arising from the interaction between the colliding jets are significantly larger as a result of the external field, the energies and morphologies of the stochastic magnetic fields post-amplification are indistinguishable. We conclude that, for turbulent laser-plasmas with supercritical magnetic Reynolds numbers, the dynamo-amplified magnetic fields are determined by the turbulent dynamicsmore »
- Authors:
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[1];
[3];
[4];
[5];
[6];
[7];
[7];
[8];
[9];
[6];
[9];
[10];
[11];
[12];
[2];
more »
- Univ. of Oxford (United Kingdom); Univ. of Princeton, NJ (United States)
- Univ. of Oxford (United Kingdom)
- Univ. of Oxford (United Kingdom); Univ. of Rochester, NY (United States)
- Queens Univ., Belfast (United Kingdom)
- Rutherford Appleton Lab., Didcot (United Kingdom); Univ. of Strathclyde, Glasgow (United Kingdom)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Univ. of Rochester, NY (United States)
- Univ. of Princeton, NJ (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Max-Planck-Inst. für Kernphysik, Heidelberg (Germany)
- UNIST, Ulsan (South Korea)
- Univ. of Nevada, Reno, NV (United States)
- Univ. of Chicago, IL (United States)
- Univ. of Oxford (United Kingdom); Univ. of Chicago, IL (United States)
- Publication Date:
- Research Org.:
- Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF); National Research Foundation of Korea (NRF)
- OSTI Identifier:
- 1875467
- Alternate Identifier(s):
- OSTI ID: 1873918; OSTI ID: 1890808
- Report Number(s):
- LLNL-JRNL-840200
Journal ID: ISSN 2468-2047; 256973; 247039; PHY-1619573; PHY-2033925; PHY-2045718; 2016R1A5A1013277; 2020R1A2C2102800; EP/M022331/1; EP/N014472/1; EP/R034737/1; TRN: US2307212
- Grant/Contract Number:
- NA0003856; B591485; B632670; NA0002724; NA0003605; NA0003934; SC0016566; NA0003868; PHY-1619573; PHY-2033925; PHY-2045718; AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Matter and Radiation at Extremes
- Additional Journal Information:
- Journal Volume: 7; Journal Issue: 4; Journal ID: ISSN 2468-2047
- Publisher:
- China Academy of Engineering Physics (CAEP)/AIP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION; Thomson scattering; Stochastic processes; Plasma dynamics; Turbulent flows; Radiography; Lasers; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Bott, A. F. A., Chen, L., Tzeferacos, P., Palmer, C. A. J., Bell, A. R., Bingham, R., Birkel, A., Froula, D. H., Katz, J., Kunz, M. W., Li, C. -K., Park, H-S, Petrasso, R., Ross, J. S., Reville, B., Ryu, D., Séguin, F. H., White, T. G., Schekochihin, A. A., Lamb, D. Q., and Gregori, G. Insensitivity of a turbulent laser-plasma dynamo to initial conditions. United States: N. p., 2022.
Web. doi:10.1063/5.0084345.
Bott, A. F. A., Chen, L., Tzeferacos, P., Palmer, C. A. J., Bell, A. R., Bingham, R., Birkel, A., Froula, D. H., Katz, J., Kunz, M. W., Li, C. -K., Park, H-S, Petrasso, R., Ross, J. S., Reville, B., Ryu, D., Séguin, F. H., White, T. G., Schekochihin, A. A., Lamb, D. Q., & Gregori, G. Insensitivity of a turbulent laser-plasma dynamo to initial conditions. United States. https://doi.org/10.1063/5.0084345
Bott, A. F. A., Chen, L., Tzeferacos, P., Palmer, C. A. J., Bell, A. R., Bingham, R., Birkel, A., Froula, D. H., Katz, J., Kunz, M. W., Li, C. -K., Park, H-S, Petrasso, R., Ross, J. S., Reville, B., Ryu, D., Séguin, F. H., White, T. G., Schekochihin, A. A., Lamb, D. Q., and Gregori, G. Mon .
"Insensitivity of a turbulent laser-plasma dynamo to initial conditions". United States. https://doi.org/10.1063/5.0084345. https://www.osti.gov/servlets/purl/1875467.
@article{osti_1875467,
title = {Insensitivity of a turbulent laser-plasma dynamo to initial conditions},
author = {Bott, A. F. A. and Chen, L. and Tzeferacos, P. and Palmer, C. A. J. and Bell, A. R. and Bingham, R. and Birkel, A. and Froula, D. H. and Katz, J. and Kunz, M. W. and Li, C. -K. and Park, H-S and Petrasso, R. and Ross, J. S. and Reville, B. and Ryu, D. and Séguin, F. H. and White, T. G. and Schekochihin, A. A. and Lamb, D. Q. and Gregori, G.},
abstractNote = {It has recently been demonstrated experimentally that a turbulent plasma created by the collision of two inhomogeneous, asymmetric, weakly magnetized, laser-produced plasma jets can generate strong stochastic magnetic fields via the small-scale turbulent dynamo mechanism, provided the magnetic Reynolds number of the plasma is sufficiently large. In this paper, we compare such a plasma with one arising from two pre-magnetized plasma jets whose creation is identical save for the addition of a strong external magnetic field imposed by a pulsed magnetic field generator. We investigate the differences between the two turbulent systems using a Thomson-scattering diagnostic, x-ray self-emission imaging, and proton radiography. The Thomson-scattering spectra and x-ray images suggest that the external magnetic field has a limited effect on the plasma dynamics in the experiment. Although the external magnetic field induces collimation of the flows in the colliding plasma jets and although the initial strengths of the magnetic fields arising from the interaction between the colliding jets are significantly larger as a result of the external field, the energies and morphologies of the stochastic magnetic fields post-amplification are indistinguishable. We conclude that, for turbulent laser-plasmas with supercritical magnetic Reynolds numbers, the dynamo-amplified magnetic fields are determined by the turbulent dynamics rather than the seed fields or modest changes in the initial flow dynamics of the plasma, a finding consistent with theoretical expectations and simulations of turbulent dynamos.},
doi = {10.1063/5.0084345},
journal = {Matter and Radiation at Extremes},
number = 4,
volume = 7,
place = {United States},
year = {Mon Jun 27 00:00:00 EDT 2022},
month = {Mon Jun 27 00:00:00 EDT 2022}
}
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